紫外线对皮肤角质形成细胞和成纤维细胞产生MMP-1和MMP-3的影响

目的:研究中波紫外线辐射对体外培养的表皮角质形成细胞和真皮成纤维细胞产生基质金属蛋白酶-1(MMP-1)和MMP-3的直接和间接影响,研究绿茶中的主要活性成分表没食子儿茶酚没食子酸酯(EGCG)对此影响的保护作用。方法:体外培养角质形成细胞株HaCaT和真皮成纤维细胞,中波紫外线辐射、不同浓度IL-6刺激及EGCG处理后,ELISA方法测定上清液中Pro-MMP-1和MMP-3蛋白含量,半定量RT-PCR方法测细胞中mRNA含量。结果:UVB30mJ/cm2辐射后角质形成细胞分泌的pro-MMP-1和MMP-3并未增加(P>0.05),真皮成纤维细胞合成和分泌MMP-1和MMP-3mRNA含量和蛋白水平均显著增加(P<0.05),IL-6(8、16、24pg/mL)可显著增加成纤维细胞产生MMP-1和MMP-3(P<0.05)。EGCG(0.15、0.3mM)能够显著抑制紫外线诱导成纤维细胞产生MMP含量的增加(P<0.05),但IL-6刺激成纤维细胞所产生的MMP-1和MMP-3的增加不受EGCG的影响(P>0.05)。结论:中波紫外线辐射并不能直接导致角质形成细胞分泌MMP-1和MMP-3增加,但紫外线辐射后角质形成细胞分泌的IL-6可促进成纤维细胞产生MMP。EGCG对IL-6刺激成纤维细胞产生MMP增加没有影响,但它可以显著抑制紫外线辐射直接导致的成纤维细胞产生MMP-1和MMP-3的增加,对防治皮肤光老化可能有一定作用。     

白介素1受体拮抗剂对紫外线辐射的成纤维细胞分泌基质金属蛋白酶1的影响

目的探讨白介素1受体拮抗剂(IL—1Ra)对紫外线(UV)辐射的成纤维细胞分泌基质金属蛋白酶1(MMP-1)的影响。方法模拟环境中UV对人体皮肤的作用方式,UVA辐射的人成纤维细胞换以UVB辐射的HaCaT培养上清继续培养。用ELISA方法检测不同处理后成纤维细胞培养上清中的 MMP-1;用实时荧光定量RT-PCR方法(荧光染料掺入法)检测IL—1Ra处理后成纤维细胞C-Jun、C-Fos 及内参照GAPDH的mRNA表达变化。结果UVA(10 J／cm2)辐射的成纤维细胞在加入不同剂量UVB(0、 1、5、10、15 mJ／cm2)辐射HaCaT的培养上清液后,其MMP—1的分泌呈增高趋势。与UVB 0 mJ/cm2比较, 于15 mJ／cm2时差异有统计学意义(t=8．413,P=0．014)。而IL—1Ra以剂量依赖方式抑制成纤维细胞的 MMP-1分泌。统计C—Jun和C—Fos的初始拷贝数以及其与GAPDH初始拷贝数的比值,结果显示IL—1Ra 以剂量依赖方式抑制成纤维细胞C—Jun的mRNA表达,对C—Fos的mRNA表达则无显著性影响。本实验应用实时荧光定量RT—PCR,其标准曲线均有良好相关性,熔解曲线证实扩增产物是特异的。结论UVB 辐射的HaCaT培养上清液能促进UVA辐射的成纤维细胞分泌MMP-1。IL—1Ra通过抑制C-Jun的 mRNA表达降低成纤维细胞的MMP—1分泌。     

反义c-jun寡核苷酸对成纤维细胞中波紫外线辐射损伤的抑制作用

目的 探讨反义c-jun寡核苷酸(ODN)转染体外培养成纤维细胞后,对中波紫外线(U-VB)辐射诱导基质金属蛋白酶(MMP)表达的抑制作用。方法 用蛋白印迹法测定UVB辐射后,成纤维细胞原癌基因c-jun和c-fos的蛋白c-jun和c-fos的表达变化;用RT-PCR方法测定c-jun反义ODN转染后,其mRNA的表达变化。用ELISA方法测定c-jun反义ODN转染后,对UVB辐射诱导的pro-MMP-1和MMP-3的合成变化。结果 不同剂量UVB(10、20、30mJ/cm²)辐射成纤维细胞,均可诱导c-jun蛋白表达显著增加,分别为未辐射对照组的1.8、2.6、3.3倍;而c-fos的表达未见显著变化。UVB辐射还可以显著增加pro-MMP-1和MMP-3的合成。不同浓度c-jun反义ODN转染成纤维细胞后,均可以抑制UVB诱导的c-junmRNA表达;对UVB诱导的pro-MMP-1和MMP-3合成具有显著抑制作用。经统计学分析,差异有显著性(P<0.01)。结论 UVB辐射诱导的pro-MMP-1和MMP-3表达可以由c-jun介导;c-jun反义ODN可以抑制pro-MMP-1和MMP-3的合成。     

紫外线诱导成纤维细胞凋亡及防护机制的初步探讨

目的 探讨紫外线诱导真皮成纤维细胞凋亡的发生机理以及绿茶多酚的主要成分表没食子儿茶素没食子酸酯(EGCG)对凋亡的保护作用。方法 用流式细胞仪及RT-PCR方法分别检测了成纤维细胞凋亡率变化以及凋亡相关基因Fas和Bcl-2 mRNA表达变化。结果 经中波紫外线(UVB)和长波紫外线(UVA)辐射的成纤维细胞,均在G1期前出现明显的亚二倍体(凋亡峰),凋亡率分别为34.79±2.24和29.69±3.05;而应用EGCG后凋亡率均明显下降为4.23±0.03和5.23±0.01。经统计学分析,差异有显著性(P<0.001)。Fas的mRNA表达在UVB及UVA辐射组均有较明显增加,分别为0.72±0.05和0.68±0.02;应用EGCG后,两组表达均明显减弱为0.35±0.02和0.47±0.03。经统计学分析,差异有显著性(P<0.001)。Bcl-2的mRNA经UVB辐射后,没有明显变化,仍有较强表达;而经UVA辐射以后,其mRNA表达明显减弱。为0.27±0.03,应用EGCG后,表达则又明显增强为0.51±0.04。结论 EGCG对UVB及UVA诱导的凋亡均有保护作用,但凋亡的发生机理以及保护机理则有所差异。     

表没食子儿茶素没食子酸酯对中波紫外浅诱导的人皮肤成纤维细胞基质金属蛋白酶-1表达的影响

目的:研究中波紫外线(UVB)诱导人皮肤成纤维细胞(FB)表达基质金属蛋白酶(MMP)-1和表没食子儿茶素没食子酸酯(EGCG)及c-Jun氨基端激酶(JNK)抑制剂SP600125对该诱导的保护作用.方法:以30 mJ/cm2 UVB及12.5μg/mL EGCG处理FB.同时以SP600125为对照,照光和(或)加药后于相应时间点提取上清及总RNA,以ELISA法检测MMP-1表达,反转录(RT)-PCR法检测细胞中MMP-1 mRNA含量.结果:30 mJ/cm2 UVB照射FB后24h MMP-1表达为对照组的3.1倍,12h及24h时MMP-1 mRNA表达分别增加至对照组的2.60倍及2.66倍(P均<0.05).UVB照射前、后加EGCG及SP600125组较单纯UVB照射组显著抑制MMP-1的表达,MMP-1 mRNA含量分别为单纯照射组的71.9%及40.4%,MMP-1蛋白表达量分别为单纯照射组的61.8%及48.9%.结论:UVB照射FB后MMP-1 mRNA及MMP-1表达水平均显著增加,EGCG可抑制UVB所致的MMP-1 mRNA及MMP-1高表达.     

红景天苷对UVA/UVB辐射的成纤维细胞中 TNF-α和 IL-1β mRNA表达的影响

目的：测定红景天苷对经UVA/UVB辐射后人皮肤成纤维细胞凋亡过程中TNF-α和IL-1β mRNA表达的影响。方法：在进行UVA/UVB辐射的体外培养人皮肤成纤维细胞实验组中加入红景天苷，应用RT-PCR法检测TNF-α和IL-1β mRNA的表达。结果： UVA/UVB辐射体外培养的成纤维细胞后，TNF-α和 IL-1β mRNA 的表达增加(0.48±0.01/0.47±0.03和0.54±0.04/0.47±0.03)；加入红景天苷后，TNF-α和IL-1β mRNA的表达降低(0.24±0.02/0.26±0.03和0.22±0.03/0.22±0.04)。结论：经UVA/UVB辐射后，体外培养人皮肤成纤维细胞中TNF-α和IL-1β mRNA的表达增高，加入红景天苷后TNF-α和IL-1β mRNA的表达降低，延缓成纤维细胞的凋亡过程。     

UVB诱导皮肤免疫抑制和表没食子儿茶素没食子酸酯光保护作用

目的 探讨表没食子儿茶素没食子酸酯（EGCG）对不同剂量中波紫外线（UVB）慢性辐射BALB／c小鼠皮肤的保护作用。方法 EGCG局部外用于小鼠背部皮肤后予不同强度UVB辐射，每日1次，连续1个月，RT-PCR法检测IFN-γ和IL-10mRNA的表达水平变化。结果 不同剂量UVB慢性辐射后小鼠皮肤中IFN-γ mRNA表达水平较对照组降低（P〈0．01），IL-10mRNA表达水平较对照组升高（P〈0．01），并与UVB辐射强度呈一定剂量依赖关系。EGCG处理后可影响UVB辐射诱导上述细胞因子表达（P〈0．01）。结论 UVB辐射下调IFN-1和上调IL-10转录水平，可能与UVB辐射诱导局部免疫抑制有关。     

紫外线及黄芪甲苷对人皮肤成纤维细胞E3连接酶Hrd1表达的影响

目的:探讨紫外线(UV)对人皮肤成纤维细胞中E3连接酶Hrd1表达的影响及黄芪甲苷的干预作用。方法:分离培养人原代成纤维细胞,分别以10J/cm~2UVA和30mJ/cm~2 UVB进行照射,黄芪甲苷进行干预处理。采用四甲基偶氮唑蓝(MTT)比色法检测不同浓度的黄芪甲苷对成纤维细胞增殖活性的影响;荧光定量PCR法检测成纤维细胞中Hrd1的mRNA表达;免疫组化法观察成纤维细胞Hrd1的蛋白表达。结果:MTT结果示:在适宜浓度下,黄芪甲苷对体外培养的成纤维细胞有显著的促增殖作用,药物浓度为10、20、30mg/L时最为明显(P0.001);荧光定量PCR结果示:UVA、UVB照射组成纤维细胞Hrd1 mRNA表达量明显高于正常对照组,而黄芪甲苷可显著抑制UV辐射后成纤维细胞中Hrd1的表达(P0.001);免疫组化结果示:UV照射(UVA或UVB)可增加Hrd1的蛋白表达,黄芪甲苷可显著抑制UV照射后成纤维细胞中Hrd1的蛋白表达。结论:UV辐射可以上调人皮肤成纤维细胞中E3连接酶Hrd1的表达,而黄芪甲苷对这一现象具有逆转作用。     

IL-1对UVA辐射成纤维细胞基质金属蛋白酶表达的影响机制探讨

目的探讨IL1(IL1α,IL1β)对长波紫外线(UVA)辐射后成纤维细胞基质金属蛋白酶(matrixmetalloproteinases,MMPs)表达的影响机制。方法用ELISA法检测UVA辐射后成纤维细胞培养上清MMP1和MMP2的表达。接着用IL1α和IL1β分别处理UVA辐射后的成纤维细胞,用Western免疫印迹法检测其丝裂原活化蛋白激酶(MAPK)的活性;用RTPCR方法检测cfos和cjun的mRNA表达。结果不同剂量UVA(0,1,5,10J/cm2)辐射的成纤维细胞分泌MMP1逐渐上升,对MMP2分泌没有影响。IL1α和IL1β(0,1,10,100ng/ml)促进UVA(10J/cm2)辐射成纤维细胞的MAPK活性表达,并以剂量依赖方式促进cjun的mRNA表达。IL1α还显著增加cfosmRNA表达,但IL1β对cfosmRNA表达无明显影响。IL1α和IL1β促进UVA辐射成纤维细胞分泌MMP1,于100ng/ml时有显著性差异(P均<0.05),但对MMP2分泌无明显影响。结论UVA辐射成纤维细胞分泌MMP1增加,对MMP2分泌没有影响。IL1(IL1α和IL1β)通过促进MAPK活性和cjunmRNA表达,IL1α还促进cfosmRNA表达使UVA辐射成纤维细胞MMP1表达增加,表明IL1在皮肤光老化的真皮胶原过度降解中发挥着重要的作用。     

中波紫外线对皮肤成纤维细胞纤维连接蛋白及EDA、EDB表达的影响

目的探讨中波紫外线UVB照射对皮肤成纤维细胞纤维连接蛋白(fibronectin,FN)及其选择性剪接片段EDA、EDB的影响。方法用RT-q PCR法检测UVB照射后成纤维细胞各时相FN及其EDA、EDB片段的mRNA表达水平。结果 UVB100m J/cm2照射后成纤维细胞FN及FN-EDA、EDB的mRNA表达均有下降。照射后1、2、4、8、12、24h组与对照组(0h)比较,差异有统计学意义(P均0.05)。结论中波紫外线UVB下调皮肤成纤维细胞FN及FN-EDA、EDB mRNA表达,在UVB引起的皮肤成纤维细胞急性光损伤过程中,FN及FN-EDA、EDB可能发挥着重要作用。     

中波紫外线对角质形成细胞MMP-1及TIMP-1的影响

目的：研究中波紫外线照射对永生化人角质形成细胞的影响。方法：绘制细胞生长曲线,用不同剂量UVB（30、60、90 mJ/cm2）照射永生化人角质形成细胞,用MTT方法测定UVB照射后细胞的增殖活性,用RT-PCR方法测定HaCaT细胞中MMP-1mRNA和TIMP-1mRNA的表达。结果：UVB照射后,HaCaT细胞的增殖活性受到抑制,MMP-1 mRNA表达增强,TIMP-1 mRNA表达下降,90 mJ/cm2照光组与未照光组比较,差异均有统计学意义。结论：UVB照射可诱导HaCaT细胞损伤和细胞凋亡,促使MMP-1mRNA表达增加,TIMP-1 mRNA表达减少,二者比例失调,这可能与光老化的发生有一定的关系。     

The effects of ultraviolet A and reactive oxygen species on the mRNA expression of 72-kDa type IV collagenase and its tissue inhibitor in cultured human dermal fibroblasts

The effects of ultraviolet A (UVA) radiation and reactive oxygen species (ROS), generated with a xanthine and xanthine oxidase (XOD) system, on collagen enzymatic degradation involving the matrix metalloproteinase (MMP) and its tissue inhibitor of metalloproteinase (TIMP) were investigated using cultured human dermal fibroblasts. Total RNA was isolated and subjected to Northern blot analysis using cDNA clones for human interstitial collagenase (MMP-1), 72-kDa type IV collagenase (MMP-2) and TIMP-2. UVA irradiation resulted in an increase in MMP-1 mRNA up to 2.3-fold, but did not stimulate MMP-2 or TIMP-2 mRNA expression. In contrast, ROS induced by the xanthine and XOD system resulted in a dose-related increase in the level of MMP-2 mRNA up to 2.1-fold and a decrease in the level of TIMP-2 mRNA by 49% in the same fibroblasts. Catalase, used as scavenger, essentially prevented the ROS-induced alterations in MMP-2 and TIMP-2 mRNA levels. These results suggest that ROS produced in the dermis may contribute to biological changes in the connective tissue matrix observed in photoaging skin by accelerating the MMP-2-related matrix degradation system. Received: 6 September 1994     

The effects of epigallocatechin-3-gallate on extracellular matrix metabolism

BACKGROUND: Anti-oxidants have attracted a lot of interest on account of their function to protect the skin from oxidative stress by ultraviolet (UV) radiation. OBJECTIVE: This study examined the effects of epigallocatechin-3-gallate (EGCG), which is a green tea extract, on the extracellular matrix (ECM) changes induced by UV radiation and showed the comparative results with retinoic acid (RA). METHODS: The ECM metabolism is tightly controlled by the collagen degrading matrix metalloprotienases (MMPs) and their tissue inhibitors (TIMPs). Therefore, the expression of MMPs and TIMP-1 was investigated to evaluate the effects of EGCG and RA. Artificial skin was made using three-dimensionally cultured keratinocytes on a collagen matrix populated with fibroblasts. EGCG and RA were added into the medium of the fibroblasts and keratinocytes culture and also applied topically on artificial skins prior to UVA irradiation. The MMPs and TIMP-1 expression levels were measured using Western blot and a zymogram. RESULTS: EGCG, like RA, decreased the level of MMPs production and increased TIMP-1 expression level. However, EGCG suppressed the activities of the gelatinases and augmented the expressions of the TIMP-1 more than RA did. RA decreased the MMP-1 and MMP-3 expression levels to a greater extent than EGCG. ECM alterations as a result of UVA appeared to be prevented more effectively using the EGCG treatment. CONCLUSION: EGCG can reverse the ECM degradation induced by UV even with a topical application of a practical-use concentration. In particular, EGCG proved to be much more effective in ROS-related conditions, such as UVA exposure.     

MMP-2, TIMP-2 and MT1-MMP are differentially expressed in lesional skin of melanocytic nevi and their expression is modulated by UVB-light

BACKGROUND: In malignant melanoma, recent studies have demonstrated an important role of matrix-metalloproteinase 2 (MMP-2), its co-activating enzyme membrane-type matrix-metalloproteinase 1 (MT1-MMP), and the endogenous inhibitor of MMP-2, tissue-inhibitor of matrix metalloproteinase 2 (TIMP-2). Melanocytic nevi are benign neoplasms of the melanocytic lineage, but may exhibit dysplastic features that can be difficult to distinguish from early stage melanoma. As shown in earlier studies, nevi show important morphological and phenotypical changes in response to ultraviolet light (UVB) irradiation. OBJECTIVE: To clarify the role of MMP-2, TIMP-2 and MT1-MMP in UVB-irradiated vs. non-irradiated melanocytic nevi. METHODS: Immunohistochemical comparison of the MMP-2, TIMP-2 and MT1-MMP expression pattern. RESULTS: MMP-2 is expressed by lesional keratinocytes and its expression is up-regulated by UVB-irradiation. MMP-2 expression was not observed in melanocytic cells. TIMP-2, by contrast, is predominantly expressed by melanocytic nevus cells, and its expression is in part down-regulated by UVB-irradiation. MT1-MMP is expressed by basal keratinocytes and to a weaker extent by melanocytic nevus cells. CONCLUSIONS: MMP-2 expression by keratinocytes in nevi probably represents the result of activation of keratinocyte turnover in lesional epidermis. MMP-2 could play a role in the downward movement of junctional nevus cells into the dermis. The reduction of TIMP-2 expression in melanocytic cells by UV-light together with the enhanced expression of MMP-2 in the adjacent epidermis may promote basement membrane degradation. The expression pattern of MT1-MMP in close proximity to epithelial-mesenchymal interfaces underlines the synergistic role of MT1-MMP in this process.     

The effects of ultraviolet A and reactive oxygen species on the mRNA expression of 72-kDa type IV collagenase and its tissue inhibitor in cultured human dermal fibroblasts

The effects of ultraviolet A (UVA) radiation and reactive oxygen species (ROS), generated with a xanthine and xanthine oxidase (XOD) system, on collagen enzymatic degradation involving the matrix metalloproteinase (MMP) and its tissue inhibitor of metalloproteinase (TIMP) were investigated using cultured human dermal fibroblasts. Total RNA was isolated and subjected to Northern blot analysis using cDNA clones for human interstitial collagenase (MMP-1), 72-kDa type IV collagenase (MMP-2) and TIMP-2. UVA irradiation resulted in an increase in MMP-1 mRNA up to 2.3-fold, but did not stimulate MMP-2 or TIMP-2 mRNA expression. In contrast, ROS induced by the xanthine and XOD system resulted in a dose-related increase in the level of MMP-2 mRNA up to 2.1-fold and a decrease in the level of TIMP-2 mRNA by 49% in the same fibroblasts. Catalase, used as scavenger, essentially prevented the ROS-induced alterations in MMP-2 and TIMP-2 mRNA levels. These results suggest that ROS produced in the dermis may contribute to biological changes in the connective tissue matrix observed in photoaging skin by accelerating the MMP-2-related matrix degradation system.     

羟氯喹及没食子酸酯对HaCaT细胞光照射的影响

目的 探讨羟氯喹和绿茶活性成分表没食子儿茶素没食子酸酯(EGCG)对中波紫外线(UVB)损伤永生化角质形成细胞株(HaCaT细胞)的保护作用及其机制。方法 采用UVB定时及定量照射培养的HaCaT细胞,分别加入羟氯喹和EGCG干预处理,以RT-PCR法检测各受试组p53、p21、c-fos基因表达水平。结果 UVB照射后可明显增加HaCaT细胞中p53,p21,c-fos mRNA表达,羟氯喹和EGCG可不同程度地下调上述基因表达水平。结论 羟氯喹和EGCG的光保护作用在HaCaT细胞可能与其抑制p53,p21,c-fos基因表达有关。